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Printing not dark enough or varied in darknessIf the print is a dismal gray rather than a sharp black, you are
probably almost out of toner. This can manifest itself evenly across the
entire page or in splotches or stripes, depending on the printer.

Sometimes you can wring a little bit more out of a toner cartridge by
taking it out and gently shaking it from side to side (never up and down,
as toner can spill out). You can also try turning up the printer’s
contrast adjustment, if it has such a knob (usually on the back side if it
exists). Faded print can also result from a dirty corona wire, because a
dirty wire inhibits a full electrical charge from being passed.

If the printouts are consistently varied in density, and you have to
frequently remove the toner cartridge and shake it to redistribute the
toner inside it, make sure the printer is sitting on an even, flat
surface.

Horizontal black linesA horizontal black line on the printout is probably the result of a
dirty or damaged roller. There are lots of rollers in the printer, and you
can use the space between the lines on the page to determine which roller
is causing the problem. Measure the distance between the errant black
lines on the page and then use Table A to determine which part
might be causing the problem.
Table
ADistance
between linesFaulty
part
0.5”
Registration
assembly
1.5”
Upper
registration roller
1.75”
Lower
registration roller
2.0”
Toner
cartridge developer roller
2.56”
Lower fusing
assembly roller
3.16”
Upper fusing
assembly roller
3.75”
Toner
cartridge photo drum

Regularly spaced splotchesIf there are evenly spaced black spots but they don’t extend all the
way across the page, the problem is probably a scratch or flaw in the drum
or a build-up of toner on the fusing roller. If the spots are less than
three inches apart vertically, it’s probably the drum, because the drum
has a larger diameter than the fusing roller.

Vertical black line on edge of pageThis can indicate an almost empty or faulty toner cartridge or (less
frequently) some spilled toner inside the printer.

I did some searching on that site and it yielded the hlep below which may give you some help.

Issue: How do I
set my printer so my printout fits the paper size I am using? Solution: Use the
recommended Print Area MP240

Printing Area
To ensure the best print quality, the machine allows a margin along each edge
of media. The actual printable area will be the area inside these
margins.
Recommended printing area (dark blue):
Canon recommends that you print within this area. ()
Printable area (light blue):
The area where it is possible to print. ()
However, printing in this area can affect the print quality or the paper feed
precision.

Hi The A4 paper size is an internationally used paper format. Although not often used in America, it is by far the most commonly and widely circulated paper size. At 8 1/4 inches by 11 3/4 inches, it is similar though not quite identical to the American standard U.S. letter size, which is 8 1/2 inches by 11 inches. Because of its ubiquity, all printers and programs have the ability to handle the size, and getting a printer to print to it is a matter of adjusting the settings.Put the A4 sized paper into the automatic feeder in the printer. You may have to adjust the tray guides to fit the paper in snugly. Close the tray firmly when finished.

Step 2.Set the printer to register the A4 sized paper inside the the tray. This varies from printer to printer but generally involves going into the print menu, scrolling to the automatic feeder and designating the tray as an A4 tray.Step 3.Select "File" and then "Page setup" in the program you are using.Step 4.lick on the drop down menu next to paper size and choose "A4.Step 5.Select "File" and then "Print." Click the "Print Summary" button to ensure the file is set to print to the A4 size.